I have another problem.I used Compiled UDFs.In my DEFINE_DPM_SOURCE,I just use S->mass and S->energy.I activate DEFINE_DPM_LAW and DEFINE_DPM_SWITCH in FLUENT in the Custom Laws panel, which is opened from the Set Injection Properties panel.I also activate DEFINE_DPM_SOURCE in FLUENT in the Discrete Phase Model panel.When I perform trajectory calculations,I can get a result if I select Uncoupled Calculations.But if I select Coupled Calculations,it's divergence detected.

So you know whats your problem now. If you inject these amount of particles through a narrow inlet, the local concentration becomes higher than 10%. U may want to perform one-way coupling and then 2way ..